Dr Benjamin's Scale references Dr. Alfred Kinsey's sexual orientation scale. A summary of that scale is below.
It should be noted that the relationship between gender identity (Benjamin's Scale) and sexual orientation (Kinsey's Scale) is probably
a result of the researchers biases. At one time you couldn't transition if you weren't completely 'homosexual' because *obviously* a 'real' female is completely heterosexual.
As transsexuals discovered this bias, they lied in order to get surgery. Fortunately today most gender clinics accept sexual orientation and gender identity are distinct.

Dr. Harry Benjamin's Gender Disorientation Scale

Kinsey's sexual orientation scale

0 Exclusively heterosexual with no homosexual experience

1 Predominantly heterosexual, only incidently homosexual

2 Predominantly heterosexual, but more than incidentally homosexual

3 Equally heterosexual and homosexual

4 Predominantly homosexual, but more than incidentally heterosexual

5 Predominantly homosexual, but incidentally heterosexual

6 Exclusively homosexual, with no heterosexual experience

Type One: Transvestite (Pseudo)

Gender Feeling: Masculine
Dressing Habits and Social Life: Lives as a man. Could get occasional kick out of dressing. Normal male life.
Sex Object Choice and Sex Life: Hetero, bi, or homosexual. Dressing and -- more --exchange may occur in masturbation fantasies mainly. May enjoy TV literature only.
Kinsey Scale: 0-6
Conversion Operation: Not considered in reality.
Estrogen Medication: Not interested or indicated.
Psychotherapy: Not wanted and unnecessary.
Remarks: Interests in dressing is only sporadic.

Type Three: Transvestism (True)

Gender Feeling: Masculine (but with less conviction.)
Dressing Habits and Social Life: Dresses constantly or as often as possible. May live and be accepted as woman. May dress underneath male clothes, if no other chance.
Sex Object Choice and Sex Life: Heterosexual, except when dressed. Dressing gives sexual satisfaction with relief of gender discomfort. May purge and relapse.
Kinsey Scale: 0-2
Conversion Operation: Actually rejected, but idea can be attractive.
Estrogen Medication: Attractive as an experiment. Can be helpful emotionally
Psychotherapy: If attempted is usually not successful as to cure.
Remarks: May assume double personality. Trend toward transsexualism.

Type Four: Transsexual (Nonsurgical)

Gender Feeling: Undecided. Wavering between TV and TS.
Dressing Habits and Social Life: Dresses as often as possible with insufficient relief of his gender discomfort. May live as a man or woman; sometimes alternating.
Sex Object Choice and Sex Life: Libido often low. Asexual or auto-erotic. Could be bisexual. Could also be married and have children.
Kinsey Scale: 1-4
Conversion Operation: Attractive but not requested or attraction not admitted.
Estrogen Medication: Needed for comfort and emotional balance.
Psychotherapy: Only as guidance; otherwise refused or unsuccessful.
Remarks: Social life dependent upon circumstances.

Type Five: True Transsexual (moderate intensity)

Gender Feeling: Feminine (trapped in male body)
Dressing Habits and Social Life: Lives and works as woman if possible. Insufficient relief from dressing.
Sex Object Choice and Sex Life: Libido low. Asexual auto-erotic, or passive homosexual activity. May have been married and have children.
Kinsey Scale: 4-6
Conversion Operation: Requested and usually indicated.
Estrogen Medication: Needed as substitute for or preliminary to operation.
Psychotherapy: Rejected. Useless as to cure. Permissive psychological guidance.
Remarks: Operation hoped for and worked for. Often attained.

Type Six: True Transsexual (high intensity)

Gender Feeling: Feminine. Total psycho-sexual inversion.
Dressing Habits and Social Life: May live and work as a woman. Dressing gives insufficient relief. Gender discomfort intense.
Sex Object Choice and Sex Life: Intensely desires relations with normal male as female if young. May have been married and have children, by using fantasies in intercourse.
Kinsey Scale: 6
Conversion Operation: Urgently requested and usually attained. Indicated.
Estrogen Medication: Required for partial relief.
Psychotherapy: Psychological guidance or psychotherapy for symptomaticrelief only.
Remarks: Despises his male sex organs. Danger of suicide or self-mutilation, if too long frustrated.

I hope visiting All Mixed Up Perspectives on Transgenderism and 'Gender Identity Disorder' was helpful and informative for you. It's taken a lot for me to figure out who I am and where I fit in the world. Part of how I now see myself is why I share these experiences with you. It's because of your visits that I continue developing this web-site! I would greatly appreciate if you would consider putting a link on your site to my site.